On Tue, Jan 18, 2011 at 12:07 PM, Vadim Smirnov vsmir...@ptsecurity.ruwrote:
Hello!
I've found a bug in execution queries like this:
SELECT ... FROM table T JOIN table2 T2 ON T2.child=T.master
WHERE T2.attr in(SELECT value FROM table3 T3 JOIN (SELECT group, MAX(value)
FROM table4 T4 WHERE T4.date_value=T2.date_value GROUP BY group) G ON
G.group=T3.group)
Such queries returns empty resultset because of invalid evaluation WHERE
T4.date_value=T2.date_value. It seems that SQLite evaluates WHERE
T4.date_value=null in fact.
It works when I try it.
Why don't you send us a specific example that does not work for you
(including CREATE TABLE statements and INSERTs to fill the tables with data)
and we'll have another look.
If we replace WHERE T4.date_value=T2.date_value with WHERE
T4.date_value=const value everything will be okey.
Sincerely Yours, Wadim Smirnov
System architect
Positive Technologies CJSC, Russia
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D. Richard Hipp
d...@sqlite.org
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